\\[-1.8ex] Soil Heterogeneity & $-$0.570$^{***}$ & $-$0.442$^{**}$ & $-$0.499$^{***}$ & $-$0.541$^{***}$ & $-$0.593$^{***}$ & $-$0.611$^{***}$ & $-$0.627$^{***}$ \\ 
  & (0.195) & (0.195) & (0.193) & (0.194) & (0.195) & (0.196) & (0.198) \\ 
\\[-1.8ex]
Observations & 23,322 & 23,322 & 23,322 & 23,322 & 23,322 & 23,322 & 23,322 \\ 
R$^{2}$ & 0.332 & 0.330 & 0.331 & 0.331 & 0.332 & 0.332 & 0.332 \\ 
